Engine cranks, but no spark, im stumped Options

[hitcachi]

Well for a little over a week now the Celica has been down. As the title says, it cranks normal but i have no spark. I have replaced so far, the timing belt (because thats what i thought it was at first before i checked for spark), distributor, ignition coil, and igniter. All fuses are good. Very expensive so far and I'm getting frustrated because its still not getting any spark. Reading some past posts, it might be the Starter relay, i haven't replaced that, but i don't know how to test it before just going out and buying a new one. If anyone can offer any suggestions or help i would really appreciate it. Thanks.

[hitcachi]

all parts replaced with new ones

I will check the crank sensor and its not throwing any codes but I dont know if thats because i pulled and checked all fuses before i ran a diagnostic and also, I was at work one night and my dad was working on it in the shop and left the key on and drained the battery, so we recharged it and I checked for codes after it had been recharged. So i don't know if the battery dying reset it or not. But I guess i don't know what you mean by the "computer box". Do you have a pic, or diagram of its location. Thanks for the help so far guys.